There are many ways of solving design problems. Some designers like to think about the problem for days before putting pencil to payer or hitting the keys. Others look for inspiration in design publications, while still others prefer to begin the process immediately by creating thumbnail sketches or experimenting on the computer.
As you begin to resolve the design, study the results carefully, not simply from an aesthetic perspective but for its effectiveness and readability. Did you accomplish what you set out to do? Does the design attract attention? Can the type be read comfortably? Are you getting the idea across? If not, can the design be saved or should you start over?
In school the instructor will accept whatever you do and grade you accordingly. In business the job is either accepted or it is not. The client is not going to grade your efforts.
Increase linespacing for long lines, for typefaces with large x-heights.